Tool-holder



G. F. KRIEGER,

TOOL HOLDER. APPLICATION FILED OCT- 18, [91 9.

Patented Aug. '16, 1921.

2 SHEETS-SHEET G. F. KRIEGER.

TOOL HOLDER.

APPLICATION FILED OCT- lB, 1919.

1,387,7 2, Patented Aug. 16,1921.

2 SHEETS-SHEET 2.

Geozyeifizkyaz',

UNITED STATES PATENT OFFICE.

GEORGE F. KRIEGER, 0F GRAND RAPIDS, WISCONSIN.

' TOOL-HOLDER.

To 1710720121 it may concern.

Be it known that I, Gnonon F. Kinsman. a citizen of the United States, residing at l'rand Rapids, in the county of Food and State of ll isconsin. have invented certain new and useful Improvements in Tool-Holders. of which the following is a specification.

This invention relates to holders for cutting oii toolsot turning lat-hes. screw machines. and the like, and has for one of its objects to simplify and improve the construction and increase the eiiicicncv and utility of devices of this character.

Another object of the invention is to provide a device of this character which will firmly hold a cutting tool and prevent it from tipping or getting out of alinement or.

from being otherwise displaced under the severe strains to which it is subjected when in use.

Another object of the invention is to provide a device of this character wherein provision is made for mutually adjusting the tool holder and the tool to adapt the tool to the work being performed.

Another object of the invention is to provide a device of this character wherein provision is made for reversing the tool so that it can be used right or left handed as required.

Vith these and other objects in view the invention consists in certain novel features of construction as hereinafter shown and then specifically pointed out in the claims. and in the drawings illustrative of the preferred embodiment of the invention,

Figure 1 is a plan view of the improved device supported from a conventional tool post, the tool post being in section.

Fig. 2 is a side elevation of the parts arranged as shown in Fig. 1. with the head in section on the line 2-2 of Fig. 1.

Fig. 3, is a plan view of a modified form of the construction.

Fig. 1 is a side elevation of the modified structure shown in Fig. 3.

Fig. 5 is a transverse section on the line 5 of Fig. 4.

Fig. 6 is an end elevation, and

Fig. 7 is a side elevation of a modified form of the clip device for holding the head member from working loose.

The improved device is designed for employment in connection with turning lathes, cutting of? machines, screw machines and Specification of Letters Patent. Patented Aug. 16-, 1921 Application filed October 18, 1919.

Serial No. 331,579.

the like, and comprises a head member represented as a whole at 10 and with a central bore therethrough. The head 10 is formed with an internal seat 11 to receive a cut-oif tool, a portion of which is represented at 12. A supporting member of novel construction is employed in connection with the improved device and comprises a body portion 13 having a reversed bend 14 to engage through the usual socket in a tool post. the latter represented conventionally at 15. The tool post is of the ordinary construction and includes a set screw 16 to retain the portion 11 of the body in place, and permits the adjustment thereof in the tool post.

At its upper end the support is formed as illustrated at 17 with the sides reversely curved as represented at 18, and the edges likewise reversely curved as represented at 19. The cutting portion of tool 12 may be of any required shape but includes a wedge shaped portion engaging in the seat 11 as shown in Fig. 2. Disposed between the tool 12 and the portions 17 of the support is a pad device 20 having one face curved to correspond to the adjacent curved portion 18 ot the support and the other side bearing flatly against the adjacent edge or face of the tool 12. Through the side of the body 10 opposite to the seat 11 are holding screws 21, the center lines of the screws being in alinementwith the curvature of the curved faces 18 ot the portion 17 of the supporting member as illustrated in Fig. 2. The dotted lines in Fig. 2 represent the radial lines of the center of the screws. By this arrangement it will be obvious that when the screws are set up against the portion 17 of the support the latter will be forced against the curved face of the pad 20 and thereby hold the cutting tool and the support firmly in relative position, and at the same time the peculiar form of the part 17 of the stock enables it to rock to a sufficient extent within the head to adapt it to different forms and thicknesses of tools and to enable the tool to clear itself in a slot cut when in operation. Preferably. a second pad represented at 22 is interposed between the portion 17 of the support and the inner ends of the clamp screws 21, the side faces of the pad 22 being in parallel relation and curved to correspond to the curvature of the adjacent portions 18 of the support as shownin Fig. 2. By this means the adjacent curved face 18 of the portion 17 of the support is protected from abrasion by the set screws, and without material increase of expense.

By forming the shank 13 with the U- shaped portion 14:, the tool holder is held with a limited degree of resiliency so that the tool will yield to abnormal pressure and thus prevent breakage.

In Figs. 34.-5 is illustrated a modified arrangement of the device which may be required with some forms of machines. In the modified structure the screws 21 are seated at their inner ends in sockets in the curve faced portion 17 of the stock as shown at 2%, in Fig. 5. In the modified structure likewise a clip device 26 is shown attached in any suitable manner to the shank 13 and carrying a set screw 25 for engaging the head 10 and steadying the head and preventing it from liding around.

7 The body 26 of the clip device may be weldedto the shank 13, for instance, electrically, as indicated in Figs. 3 4.- and 5, or formed to bear around the shank, as shown in Figs. 6 and 7. i

A very strong cushion like device is thus provided which will prevent the breakage of the tool under abnormal strain, and by providing the tool holder above described the tool is likewise prevented from digging in when in use. The improved shank springs in event of its sticking in its own slot, or in case of overheating, or when no oil is present. The portion 17 of the support is preferably extended in advance of the head 10 to a sufficient extent to receive a holding pin or like device 23, to prevent the accidental displacement of the head when the tool 12 is removed or being changed.

The improved device is simple in constructi0n, c an be inexpensively manufactured of any required size andadapted to tools of any strength or size, and will be found to be a very useful article in machine shops.

Having thus described the invention what is claimed as new is- 1. A tool holder comprising a hollow head having an internal tool seat, a support extending into the head With reversely curved faces. a pad member having one face curved to correspond to and bear againstone of the curved side faces of the support and the other face adapted to bear against a tool when. engaging in the seat, and clamp screws tapped through the head with their center lines radially of the curvature of the support and operating to hold the same in the head.

2. A tool holder comprising a hollow head having an internal tool seat, a'support extending at one end into the head with the sides and ends reversely curved, a pad member having one face curved to correspond to and bear against one of the curved side faces of the support and the other face adapted to bear against a tool when engaging in the seat, and clamp screws tapped through the head with their center lines radially of the curvature of the support and operating to hold the support and tool in the head.

3. A too-l holder comprising a hollow head and having an internal tool seat, a support extending at one end. into the head with the sides and ends reversely curved, said support having a return bend adapted to engage in a holding device, a pad member having one face curved to correspond to and bear against one of the, curved side faces of the support end and the other face adapted to bear against the tool when engaging in the seat, and clamp screws tapped through the head with their center lines radially of the curvature of the support and operating to hold'the support and tool in the head.

a. A tool holder comprising a hollow head having an internal tool seat, a support extending into the head with reversely curved faces, a pad member having one face curved to correspond to and bear against one of the curved side faces of the support and the other face adapted to bear against a tool when engaging in the seat, and clamping means operating to hold the parts in adj usted position.

5. The combination with a holdingdevice, of a support having a return bend to engage in the holding device and with the side faces reversely curved, a hollow head member have ing an internal tool seat, a pad member having one face curved to correspond to and bear against one of the curved side faces of the support and the other face adapted to bear against a tool when engaging in the seat, and clamp screwstapped through the head with their center lines radially of the curvature of the support and operating to hold thevparts inadjusted position.

6. in a device of the character described,

a shank formed with coacting portions hav ing a curved longitudinal axis, one of said portions adapted to be supported in a stationary holder, and the other portion formed with reversely curved faces, a hollow head for receiving the portion having the curved faces and a pad member having one face curved to correspond to and bear against one of the curved side faces of the shank and the other face adapted to bear against a tool when engaging in the seat, and clamp screws tapped through the head and operating to hold the shank in the head.

In testimony whereof, I aflix my s gnature hereto. 1

Gnonen .F. KRIEGER. 

